arcgis server9.2 到出图片函数

/// <summary>
        /// Exports the current extent & visible layers on mapctrl to the specified format and the specified size.
        /// </summary>
        /// <param name="mapctrl">Map control to export layout from</param>
        /// <param name="Size">Graphic Size</param>
        /// <param name="Format">Graphic Ouput Format (JPG,PDF,PNG)</param>
        /// <returns>URL to exported map layout</returns>
        public string MapExportLayout(ESRI.ArcGIS.ADF.Web.UI.WebControls.Map mapctrl, string Size, string Format)
        {

            ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality ags_mf = (ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapFunctionality)mapctrl.GetFunctionality(1);
            ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceLocal ags_mr = (ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.MapResourceLocal)ags_mf.Resource;

            // Get Server Object from Server Context
            ESRI.ArcGIS.Server.IServerContext SC = ags_mr.ServerContextInfo.ServerContext;

            //get map description
            ESRI.ArcGIS.ADF.ArcGISServer.MapDescription CurADFMD = ags_mf.MapDescription;
            //update extent to current extent
            CurADFMD.MapArea.Extent = ESRI.ArcGIS.ADF.Web.DataSources.ArcGISServer.Converter.FromAdfEnvelope(mapctrl.Extent);
            //update layers to current layers on/off
            for (int i = 0; i < CurADFMD.LayerDescriptions.Length; i++)
            {
                ESRI.ArcGIS.ADF.ArcGISServer.LayerDescription Layer = (ESRI.ArcGIS.ADF.ArcGISServer.LayerDescription)CurADFMD.LayerDescriptions.GetValue(i);
                Layer.Visible = ags_mf.GetLayerVisibility(Layer.LayerID.ToString());
            }

            //convert map description to carto com map description
            ESRI.ArcGIS.Carto.MapDescription CurCartMD = (ESRI.ArcGIS.Carto.MapDescription)ESRI.ArcGIS.ADF.ArcGISServer.Converter.ValueObjectToComObject(CurADFMD, SC);

            //Get Map Server obj
            ESRI.ArcGIS.Carto.IMapServer MapServer = (ESRI.ArcGIS.Carto.IMapServer)SC.ServerObject;

            ESRI.ArcGIS.Carto.IMapServerInfo MapServerInfo = (ESRI.ArcGIS.Carto.IMapServerInfo)MapServer.GetServerInfo(MapServer.DefaultMapName);

            ESRI.ArcGIS.Carto.IMapDescription MD = (ESRI.ArcGIS.Carto.IMapDescription)MapServerInfo.DefaultMapDescription;

            // Create Image Type obj
            ESRI.ArcGIS.Carto.IImageType ImgType = SC.CreateObject("esriCarto.ImageType") as ESRI.ArcGIS.Carto.IImageType;

            // Create Image Display Obj
            ESRI.ArcGIS.Carto.IImageDisplay ImgDisplay = SC.CreateObject("esriCarto.ImageDisplay") as ESRI.ArcGIS.Carto.IImageDisplay;

            // Create Image Description Obj
            ESRI.ArcGIS.Carto.IImageDescription ImgDesc = SC.CreateObject("esriCarto.ImageDescription") as ESRI.ArcGIS.Carto.IImageDescription;


            //Set Image Format
            switch (Format)
            {
                case "PDF":
                    ImgType.Format = ESRI.ArcGIS.Carto.esriImageFormat.esriImagePDF;
                    break;
                case "JPG":
                    ImgType.Format = ESRI.ArcGIS.Carto.esriImageFormat.esriImageJPG;
                    break;
                case "PNG":
                    ImgType.Format = ESRI.ArcGIS.Carto.esriImageFormat.esriImagePNG;
                    break;
            }

            ImgType.ReturnType = ESRI.ArcGIS.Carto.esriImageReturnType.esriImageReturnURL;


            //Set Image Size
            switch (Size)
            {
                case "800x600":
                    ImgDisplay.Height = 600;
                    ImgDisplay.Width = 800;
                    break;
                case "1024x768":
                    ImgDisplay.Height = 768;
                    ImgDisplay.Width = 1024;
                    break;
                case "1280x720":
                    ImgDisplay.Height = 720;
                    ImgDisplay.Width = 1280;
                    break;
                case "1280x1024":
                    ImgDisplay.Height = 1024;
                    ImgDisplay.Width = 1280;
                    break;
            }
            try
            {
                ImgDisplay.DeviceResolution = double.Parse(Size);
            }
            catch (Exception e)
            {
                ImgDisplay.DeviceResolution = 90;
            }


            ImgDesc.Type = ImgType;
            ImgDesc.Display = ImgDisplay;

            //Get Map Layout
            ESRI.ArcGIS.Carto.IMapServerLayout MapLayout = MapServer as ESRI.ArcGIS.Carto.IMapServerLayout;
            ESRI.ArcGIS.Carto.IPageDescription PD = MapLayout.DefaultPageDescription;

            //Get default map desc
            ESRI.ArcGIS.Carto.IMapFrameDescription MapFrameDesc = PD.MapFrames.get_Element(0);

            ESRI.ArcGIS.Carto.IMapDescription DefMapDesc = MapFrameDesc.MapDescription;

            //Set default Map Description to current Map description, assuming we use first map frame here, change if necessary
            PD.MapFrames.get_Element(0).MapDescription = CurCartMD;

            //Export Layout
            ESRI.ArcGIS.Carto.ILayoutImage LayoutImg = MapLayout.ExportLayout(PD, ImgDesc);

            //Return URL to Image
            return LayoutImg.URL;